Method of measuring 'shearing' forces on the sole of the foot

Tappin, J.W.; Pollard, Jennifer; Beckett, E A

doi:10.1088/0143-0815/1/1/006

Cited by 70 publications

(19 citation statements)

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“…Some measurements in previous studies were conducted using uniaxial or biaxial force transducers (Akhlaghi and Pepper, 1996;Hosein and Lord, 2000;Lebar et al, 1996;Lord et al, 1992;Lord and Hosein, 2000;Tappin et al, 1980;Tappin and Robertson, 1991). Uniaxial shear transducers can only measure shear stress in one direction.…”

Section: Introductionmentioning

confidence: 99%

Effect of heel height on in-shoe localized triaxial stresses

Yan

Cheung

Leung

et al. 2011

Journal of Biomechanics

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Section: Introductionmentioning

confidence: 99%

Effect of heel height on in-shoe localized triaxial stresses

Yan

Cheung

Leung

et al. 2011

Journal of Biomechanics

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“…'4 triaxial force transducer was developed by Williams et al [27]. It was of dimension 16 mm diameter and 3.8 mm thickness and was a modified design of a single-axis shear sensor developed by Tappin et al [24]. Shear measurements were achieved using three aluminum disks, each of the outer two containing a semiconductor field coil and the center one containing a magnet.…”

mentioning

confidence: 99%

Measurement of stresses in three orthogonal directions at the residual limb-prosthetic socket interface

Sanders

Daly

1993

IEEE Trans. Rehab. Eng.

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Transducers were developed to measure stresses in three orthogonal directions applied on a below-knee amputee residual limb within a prosthetic socket during walking. Straingage measurement techniques were used for all three orthongonal directions. Instrumentation error for four transducers averaged less than 4.2% full-scale output (FSO) for the normal direction and less than 0.9% FSO for shear directions. Measurements from amputee subjects collected during walking trials are presented.

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“…Unfortunately the instrumentation developed to measure plantar shear were limited in terms of (i) being capable of recording only uniaxial shear (i.e. antero-posterior), (ii) suffering low spatial resolution (Davis et al, 1998) or (iii) not being practical (Tappin et al, 1980;Akhlaghi and Pepper, 1996;Lord and Hosein, 2000) due to calibration difficulties and cross-talk between shear and pressure channels.…”

Section: Introductionmentioning

confidence: 99%

Plantar shear stress distributions: Comparing actual and predicted frictional forces at the foot–ground interface

Yavuz¹,

Botek²,

Davis³

2007

Journal of Biomechanics

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Plantar shear stresses are believed to play a major role in diabetic ulceration. Due to the lack of commercial devices that can measure plantar shear distribution, a number of mathematical models have been developed to predict plantar frictional forces. This study assessed the accuracy of these models using a custom built platform capable of measuring plantar stresses simultaneously. A total of 48 (38 healthy and 10 diabetic) human subjects (75 ± 20kg, 41 ± 20 yrs, 32 male, 16 female) were recruited in the study. Plantar force data were collected for 2 seconds at 50Hz. Two models (M1 and M2) reported in the literature by different groups were used to predict local shear stresses. Root mean squared errors (RMSE) were calculated to compare model data with the actual data, focusing on three parameters: location, magnitude and timing of peak shear components. RMSE values of estimated peak AP and ML shear locations were 3.1 cm and 2.2 cm for M1 and 3.1 cm and 2.1 cm for M2, respectively. Magnitude RMS error values for M1 were found to be 86.6 kPa in AP shear and 38.5 kPa in ML shear, whereas these values were determined to be 97.8 kPa and 63.5 kPa respectively by M2. Time to peak shear RMSE values averaged 17.2% in terms of the gait duration. In conclusion, shear models that were evaluated in this study performed variously depending on the shear parameter.

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Method of measuring 'shearing' forces on the sole of the foot

Cited by 70 publications

References 1 publication

Effect of heel height on in-shoe localized triaxial stresses

Effect of heel height on in-shoe localized triaxial stresses

Measurement of stresses in three orthogonal directions at the residual limb-prosthetic socket interface

Plantar shear stress distributions: Comparing actual and predicted frictional forces at the foot–ground interface

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